I have recently built a 80386 system. Lacking any AT PSU I connected a PicoPSU using an ATX->AT power adapter. Only card connected was a gpu (Trident TVGA 9000i). System performed BIOS checkup sequence without errors and reached boot stage. I did not connect a MultiIO card so did not proceed to booting.
PicoPSU is not v.1.x of ATX standard and so does not provide any -5 Volts capability. From what I have read, -5V is needed only by ISA bus and only from those cards requiring it (5th pin of back side of card, named B05 in ISA pinout.
My question is: If I stick to ISA cards which do not need -5v (lack of B05 contact in card) do I face any other risks when resorting to an ATX->AT conversion so as to power the board?